Tag Archives: digital preservation

Email Preservation: How Hard Can it Be? DPC Briefing Day

On Thursday 6th July 2017 I attended the Digital Preservation Coalition briefing day in partnership with the Andrew W. Mellon Foundation on email preservation titled ‘Email preservation: how hard can it be?’. It was hosted at The National archives (TNA), this was my first visit to TNA and it was fantastic. I didn’t know a great deal about email preservation prior to this and so I was really looking forward to learning about this topic.

The National Archives, Photograph by Mike Peel (www.mikepeel.net)., CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=9786613

The aim of the day was to engage in discussion about some of the current tools, technologies and thoughts on email preservation. It was orientated around the ‘Task Force on Technical Approaches to Email Preservation’ report that is currently in its draft phase. We also got to hear about interesting case studies from the British library, TNA and Preservica, each presenting their own unique experiences in relation to this topic. It was a great opportunity to learn about this area and hear from the co-chairs (Kate Murray and Christopher Prom) and the audience about their thoughts on the current situation and possible future directions.

We heard from Jonathan Pledge from British library (BL). He told us about the forensic capture expertise gained by the BL and using EnCase to capture email data from hard drives, CD’s and USB’s. We also got an insight into how they are deciding which email archive tool to use. Aid4mail fits better with their work flow however ePADD with its holistic approach was something they were considering. During their ingest they separate the emails from the attachments. They found that after the time consuming process of removing emails that would violate the data protection laws, there was very little usable content left, as often, entire threads would have to be redacted due to one message. This is not the most effective use of an archivist time and is something they are working to address.

We also heard from Anthea Seles who works with government collections at TNA. We learnt that from their research, they discovered that approximately 1TB of data in an organisations own electronic document and records management system is linked to 10TB of related data in shared drives. Her focus was on discovery and data analytics. For example, a way to increase efficiency and focus the attention of the curator on was to batch email. If an email was sent from TNA to a vast number of people, then there is a high chance that the content does not contain sensitive information. However, if it was sent to a high profile individual, then there is a higher chance that it will contain sensitive information, so the curator can focus their attention on those messages.

Hearing from Preservica was interesting as it gave an insight into the commercial side of email archiving. In their view, preservation was not an issue. For them, their attention was focused on addressing issues such as identifying duplicates/unwanted emails efficiently. Developing tools for performing whole collection email analysis and, interestingly, how to solve the problem of acquiring emails via a continuous transfer.

Emails are not going to be the main form of communication forever (the rise in the popularity of instant messaging is clear to see) however we learnt that we are still expecting growth in its use for the near future.

One of the main issues that was bought up was the potential size of future email archives and the issue that come with effective and efficient appraisal. What is large in academic terms, e.g. 100 000 emails, is not in government. The figure of over 200 million emails at the George W. Bush presidential library is a phenomenal amount and the Obama administrations is estimated at 300 million. This requires smart solutions and we learnt how the use of artificial intelligence and machine learning could help.

Continuous active learning was highlighted to improve searches. An example of searching for Miami dolphins was given. The Miami Dolphins are an American football team however someone might so be looking for information about dolphins in Miami. Initially the computer would present different search results and the user would choose which the more relevant result is, over time it will learn what it is the user is looking for in cases where searches can be ambiguous.

Another issue that was highlighted was, how do you make sure that you have searched the correct person? How do you avoid false positives? At TNA the ‘Traces Through Time’ project aimed to do that, initially with World War One records. This technology, using big data analytics can be used with email archives. There is also work on mining the email signature as a way to better determine ownership of the message.

User experience was also discussed. Emulation is an area of particular interest. The positive of this is that it recreates how the original user would have experienced the emails. However this technology is still being developed. Bit level preservation is a solution to make sure we capture and preserve the data now. This prevents loss of the archive and allows the information and value to be extracted in the future once the tools have been developed.

It was interesting to hear how policy could affect how easy it would be to acquire email archives. The new General Data Protection Regulation that will come into effect in May 2018 will mean anyone in breach of this will suffer worse penalties, up to 4% of annual worldwide turnover. This means that companies may air on the side of caution with regards to keeping personal data such as emails.

Whilst the email protocols are well standardised, allowing emails to be sent from one client to another (e.g. AOL account from early 1990’s to Gmail of now) the acquisition of them are not. When archivists get hold of email archives, they are left with the remnants of whatever the email client/user has done to it. This means metadata may have been added or removed and formats can vary. This adds a further level of complexity to the whole process

The day was thoroughly enjoyable. It was a fantastic way to learn about archiving emails. As emails are now one of the main methods of communication, for government, large organisations and personal use, it is important that we develop the tools, techniques and policies for email preservation. To answer the question ‘how hard can it be?’ I’d say very. Emails are not simple objects of text, they are highly complex entities comprising of attachments, links and embedded content. The solution will be complex but there is a great community of researchers, individuals, libraries and commercial entities working on solving this problem. I look forward to hearing the update in January 2018 when the task force is due to meet again.

Initiating conversation: let’s talk about web content (part 2)

Colin Harris, Superintendent of Special Collections reading rooms. Chosen site: cyndislist.com

‘I am a founding member of Oxfordshire Family History Society and I’ve long been interested in family history. As a phenomena it surged in popularity in the 1970’s. In about 1973 there was great curiosity (in OFHS) in Bicester as everyone was interested in the popular group, The Osmonds (who originated from Bicester!). Every county has a family history society and I would say it’s they who have done the lion’s share of the work. All of their work and indexing…it’s all grist to the mill in terms of recording names and events.

So the website I would like to have access to in 10 years’ time is cyndislist.com, which is one of the world’s largest databases for genealogy. In fact it’s been going for over 21 years already. This was launched on the 4th March 1996. The family history people have been right there from the very beginning, it’s been growing solidly since then; it’s fantastic. It covers 200 categories of subjects, it has links to 332,000 other websites, and it’s the starting point for any genealogical research. The ‘Cyndi’ is Cyndi Howell, an author in genealogy.

Almost every day the site is launching content that might be interesting in some particular subject. So just going back within the last couple of weeks: an article on Telling the Orphan’s story; Archive lab on how to preserve old negatives; The key to family reunion success and DNA: testing at a family reunion! Projects even go beyond individuals…they explore a Yellowstone wolf family. There is virtually nothing that is untouched. Anything with a name to it has potential for exploration.

To be honest, I haven’t been able to do any family history research since 1980, but I am hoping to do some later on this year (when I retire). All these years that have passed has meant that so much is available to be accessed over the internet

Actually I’d love to see genealogy and family history workers and volunteers getting more recognition for the fantastic amount of industrious and tech savvy work they do. Family history is something for people from all walks of life. Our history, your history, my history is something very personal. As I say, 21 years and going strong; I’d love to see the site going stronger still in 10 years’ time.’


 

Pip Willcox, Head of the Centre for Digital Scholarship and Senior Researcher at Oxford e-Research. Chosen site: twitter.com

Twitter is an amazing tool that society has used to show the best of what humanity is at the moment…we share ideas, we share friendship, fun and joy, we communicate with others around the world, people help each other. But, it shows the worst of what humans can do. The news we see is just the tip of the iceberg – the levels of abuse that users, particularly minority groups, receive is appalling. Twitter is a fantastic place to meet people who think very differently from us, people who come from different backgrounds, have had different experiences, who live far from us, or close by but we might not otherwise have met. It is so rich, so full of potential, and some of what we do with it is amazing, yet some of what we do with it is appalling.

The question for the archive is “which Twitter?” There is the general feed, what you see if you don’t sign in. Then there are our individual feeds, where we curate our own filter bubbles, customizing what we see through our accounts. You can create a feed around a hashtag, an event, or slice it by time or location. All of these approaches will affect the version of Twitter we archive and leave for the future to discover.

These filter bubbles are not new: we have always lived in them, even if we haven’t called them that before. Last year there was an experiment where a series of couples who held diametrically opposing views switched Twitter accounts and I found that, and their thoughtful response to it fascinating.

Projects like Cultures of Knowledge, for example, which is based at the History Faculty here at the University of Oxford, traces early modern correspondence. This resource lets you search for who was writing to whom, when, where, and the subjects they were discussing. It’s an enormously rich, people-centred view of the history of ideas and relationships across time and space, and of course it points readers on in interesting directions, to engage closely with the texts themselves. This is possible because the letters were archived and catalogued over the years, over the centuries by experts.

How are we going to trace the conversations of the late 20th and the early 21st centuries? The speed at which ideas flow is faster than ever and their breadth is global. What will future historians make of our age?

I’m interested from a future history as well as a community point of view. The way we are using Twitter has already changed and tracking its use, reach, and power seems to me well worth recording to help us understand it now, and to help explain an aspect of our lives to future societies. For me, Twitter makes the world more familiar, and anything that draws us together as a global community, that reinforces our understanding that we share one planet, that what we have in common vastly outweighs what divides us, and that helps us find ways to communicate is a good and a necessary thing.’

 


 

Will Shire, Library Assistant, Philosophy and Theology Faculty Library. Chosen site: wikipedia.org

‘It’s one of the sites I use the most…it has all of human knowledge. I think it’s a cool idea that anyone can edit it – unlike a normal book it’s updated constantly. I feel it’s derided almost too much by people who automatically think it’s not trustworthy…but I like the fact that it is a range of people coming together to edit and amend this resource. As a kid I bothered my mum all the time with constant questioning of ‘Why is this like this, why does it do that. Nowadays if you have a question about anything you can visit wikipedia.org. It would be really interesting to take a snapshot of one article every month or week in order to see how much it changes through user editing.

 Also, I studied languages and it is extremely useful for learning new vocabulary as the links at the side of the article can take you to the content in other available languages. You can quite easily look at different words or use it as a starter to take you to different articles in other languages that aren’t English.’


 

 

 

 

Why archive the web?

Here at the Bodleian Libraries’ Web Archive (BLWA), the archiving process starts with a nomination – either by our web curators or by you, the public. The nominated URLs the BLWA team then select for archiving are those specifically identified as being of lasting value and significance for preservation.

Not only are the sites chosen from a preservation standpoint – we are also continually seeking to build up the scope and content of our 7 collections within the BLWA: University of Oxford; University of Oxford colleges; University of Oxford museums, libraries and archives; social sciences; arts and humanities; international and science, medicine and technology. Exactly like the use of a physical collection, the sites belonging to the web collection will be used for research, fact checking, discovery and collaboration. There can be no denying that the web is the platform on which so much of contemporary society occurs. In the future then, and indeed now, web archives are providing an insight into our history.

Anti-Apartheid Movement Archives – http://www.aamarchives.org/

The AAMA site is part of our international collection in the BLWA. Within this collection we have captured the aamarchives.org 7 times since 24th November 2015. This online platform is vital for digital access to further research, cross-cultural relationships and efforts towards understanding the history of the British Anti-Apartheid Movement 1959 – 1994. This capture has preserved the navigation and functionality of the site and links still resolve; for example the user community can still browse the archive, learn about campaigns and download resources. The date and time is clearly displayed in the banner at the top.

BLWA’s first capture of the online AAMA

This website can also be used and explored in conjunction with our related physical holdings. Here at the Bodleian Special Collections we have an amazing depth and range of physical material in the Anti-Apartheid Movement archive and our Commonwealth and African studies collections. You can browse the catalogue for this here.

This archived capture is fully functional, like a live site.

This is a tangible example of how digital preservation enhances and complements physical material and ensures records can reach a wider audience. How exciting it is that a researcher can consult manuscript or archived material, alongside captures of websites from the past in order to gain more of an insight and have a wider scope of substance to survey!

Web content like the aamarchives.org/ is not as stable as you might presume. A repository of web based collections enables future discovery of internet sites that are perhaps taken for granted due to the nature of our technological society; everything is just a tap or a click away. In fact, much of the material we interact with today is only available online. The truth is that web content is ephemeral: there is a very real threat that it can rapidly change and disappear altogether. Therefore web archiving initiatives are vital to preserve these valuable resources for good. Through these captures, provenance, arrangement and content have been preserved; and arguably most importantly of all – access.

Both individual collections and the web archive as a whole can be searched for a specific site, or browsed at leisure.

Growth of open access and web based initiatives mean that there is an ever increasing network of digital libraries on a global scale. There is no doubt that the practice of web archiving is a significant contribution towards ensuring knowledge for all. Access to the Internet enabling access to an ever growing knowledge depository is central to the integrity of educational and professional research, web archiving and on a larger scale, digital preservation.

Browse our collections in Bodleian Libraries’ Web Archive

Get involved and help preserve our history! Nominate a site to archive

Initiating conversation: let’s talk about web content (part 1)

To initiate conversation about preserving web content and to encourage people to think about why archiving the web is so important, I asked staff at the Bodleian Libraries to imagine the following: If you could choose just one website to have guaranteed access to in 10 years’ time what would it be – and why? Keep reading to discover staff answers and perspectives…

Richard Ovenden, Bodley’s Librarian, Bodleian Libraries. Chosen site: bodleian.ox.ac.uk

‘Obviously as somebody who is leading this institution, seeing its history reflected in the institutional website is so significant. If you go back to the archived captures of bodleian.ox.ac.uk that are accessible now through the Internet Archive it’s incredible not only to see evolution of the HTML site itself and the look and feel of it but just to see how it reflects the changes in the organisation since the 1990’s when the first Bodleian website was set up…which was actually the first library in the UK to have a website.

We can see the changes to the way the Bodleian Libraries reflect their public persona through the web but also the website is a useful proxy for how the organisation itself has changed: the organisational structure, the administrative arrangements, the policies and strategies, how the web is a reflection of those changes over the past 20 years is really interesting. And in 10 years’ time it would be over 30 years and there will be another decade of evolution, growth, change…the web is a very convenient place to see that at a glance. We obviously archive a large number of institutional and administrative records in paper and digital form but it’s a huge amount to wade through, whereas the web provides a very convenient lens to view our organisational past through. I can’t think of another way, so conveniently, to chart our history, our progress, our challenges and even some of the mistakes that we’ve made as an organisation over that time.

Our organisation as a whole changed dramatically in the year 2000 when we stopped being just the historic Bodleian Library and we were integrated with the departmental faculty libraries. We then changed our name to University of Oxford Library services, then back to the Bodleian. Through the website you can actually see that extraordinary change. It’s such a convenient way of getting a grip on our history’.


Lukasz Kowalski, Bodleian Library Reader Services, Weston Library. Chosen site: stackexchange.com

‘I was thinking “what’s the website with the most information in it?”. My initial thought was Wikipedia.org. But I could easily live without it if I had to, as probably most knowledge contained in it is available in print. My next thought was stackexchange.com. It facilitates an exchange of knowledge and collective problem-solving on a large scale, otherwise unattainable via printed media. It’s supported by a large community of users, including experts in their fields. Together with its sister sites, it covers virtually any discipline and questions that can be asked and answered. Stackexchange is a web of knowledge, but different from Wikipedia. Rather than being organised knowledge it is more organised thinking.

My background is in Physics and I have used this site to further my understanding of concepts which did not have clear explanations in textbooks, or when I wanted to check that my thinking about a solution to a given problem was on the same page as others.

I think it goes back to what, I guess, the internet was about in the first place: the exchange of knowledge and ideas, and such is the character of this site. It’s great to rely on good teachers if one has access to them – but it is wonderful that people from across the world can gain a deeper understanding of concepts and exchange ideas by connecting more readily with those who have the expertise.’


 

Sophie Quantrell, Library Assistant, Philosophy and Theology Faculty Library. Chosen site: youtube.com

‘I was thinking about youtube.com as a resource mainly because it’s so versatile. It can be used to display images, sound…I’ve seen some people use it for musical scores – putting musical scores alongside the sound and that sort of thing. I think it is a site that can be used almost for any purpose – so you’ve got the social aspect of it with the comments and the interaction as well as the instructional aspect. I learn sign language when I am not busy with other things [gestures around her at the library] so to be able to see and learn it through videos it is great…it’s much more difficult to tell what the signs are if all you’ve got are drawings on a piece of paper!

It can link to videos on so many different topics, like instructional TED talks. There are so many good quality resources online that get overlooked with all the cat videos. It also crosses cultural boundaries…you can upload and view videos in whatever language you want. You could post a video from Australia and someone could be watching it in Kazakhstan!’


Iram Safdar, Graduate Trainee Digital Archivist, Weston Library. Chosen site: wikipedia.org

Wikipedia has been the main source for my knowledge since I was a kid. It’s also provided me with countless hours of entertainment by following the breadcrumb trail of links and seeing where you end up! All sorts of hilarity ensues when you find a rogue edit by someone…I like that it is an open source resource.

Similarly, it shows you what society thinks about things and reveals how we view stuff…which I think in a broader sense is quite interesting.’


Keep an eye out for part 2 and more staff insights coming up on the Archives and Modern Manuscripts blog imminently…

 

iPRES 2016

Last month, I attended the 13th International Conference on Digital Preservation, this year hosted in Bern, Switzerland. The four days of papers, panels, posters and workshops were an intensive and exciting opportunity to meet with colleagues working in digital preservation around the world, share ideas, and hear about innovative projects and approaches. The topics ranged widely from technical systems and practices, to quality and risk assessment, and stewardship and sustainability. What follows are just a couple of highlights from a really fascinating week.

Networking wall

The post-it note networking wall: What do you know? What do you want to know?

Net-based and digital art

As email, digital documents and social media replace traditional forms of communication, it is crucial to be able to preserve born-digital material and make it accessible. An area which I hadn’t previously considered was the realm of net-based art. Here, the internet is used as an artistic medium, which of course has implications (and complications) for digital preservation.

In her key-note speech, Sabine Himmelsbach from the House of Electronic Arts in Basel, introduced us to this exciting field, showing artwork such as Olia Lialina’s ‘Summer’, 2013, shown below.

Summer, by Olia Lialina

Screenshot of Summer, Olia Lialina, 2013. Available at https://www.youtube.com/watch?v=SxvHoXdC4Uk

The artwork features an animated loop of Lialina swinging from the browser bar. Each frame is hosted by a different website, and the playback therefore depends on your connection speed. This creative use of technology creates enormous challenges for preservation. Here, rather than preserving artefacts, it is the preservation of behaviours which is crucial, and these behaviours are extremely vulnerable to obsolescence.

Marc Lee’s ‘TV Bot’ is another net-based artwork, which is automated to broadcast current news stories with live TV streams, radio streams and webcam images from around the world. Reliant on technical infrastructure in this way, the shift from Real Player to Adobe Flash Player was one such development which prevented ‘TV Bot’ from functioning. The artist then not only worked on technical migration, but re-interpreted the artwork, modernising the look and feel, resulting in ‘TV Bot 2.0’ in 2010. This process soon happened again, this time including a twitter stream, in ‘TV Bot 3.0’, 2016. In this way, the artist is working against cultural, as well as technical obsolescence.

Marc Lee, 'TV Bot 2.0', 2010. Image from http://ceaac.org/en/artistes/marc-lee

Marc Lee, ‘TV Bot 2.0’, 2010. Image from http://ceaac.org/en/artistes/marc-lee

The heavy involvement from the artist in this case has helped preserve the artwork, but this process cannot be sustained indefinitely. Himmelsbach ended her speech by stressing the need for collaboration and dialogue, which emerged as a central theme of the conference.

A new approach to web archiving

Another highlight was the workshop on Webrecorder lead by Dragan Espenschied from Rhizome. He introduced their new tool which departs from the usual crawling method to capture web content ‘symmetrically’, which results in incredibly high-fidelity captures. The demonstration of how the tool can capture dynamic and interactive content sparked gasps of amazement from the group!

Webrecorder not only captures social media, embedded video and complex javascript (often tricky with current tools), but can actually capture the essence of an individual’s interaction with the web-content.

How it works: Webrecorder records all the content you interact with during the recording session. Users are then able to interact with the content themselves, but anything that was not viewed during the recording session will not be available to them.

Current web archiving strategies aren’t able to capture the personalised nature of web use. How to use this functionality is still a big question, as a web recording in this way would be personal to the web archivist: showing what they decided to explore, unless a systematic approach was designed by an institution. This itself would be very resource-intensive, and is arguably not where the potential of Webrecorder lies: the ability to capture dynamic content, such as net-based artworks. However, the possibility of preserving not only web content, but our interaction with it, is a very exciting development.iPRES 2016 balloon

iPRES 2016 was a fantastic opportunity to gain insight into projects happening around the world to further digital preservation. It showed me that often there are no clear answers to ‘which file format is best for that?’ or ‘how do I preserve this?’ and that seeking advice from others, and experimenting, is often the way forward. What was really clear from attending was that the strength and support of the community is the most valuable digital preservation tool available.

 

Preserving Digital Sound and Vision: A Briefing 8th April 2011

Last Friday I went along to the DPC briefing Preserving Digital Sound and Vision. I was particularly interested in the event because of digital video files currently held on DVD media at the Bodleian.

After arriving at the British Library and collecting my very funky Save the Bits DPC badge I sat down to listen to a packed programme of speakers. The morning talks gave an overview of issues associated with preserving audio-visual resources. We began with Nicky Whitsed from the Open University who spoke about the nature of the problem of preserving audio-visual content; a particularly pertinent issue for the OU who have 40 years of audio-visual teaching resources to deal with. Richard Ranft then gave a fascinating insight into the history and management of the British Library Sound Archive. He played a speech from Nelson Mandela’s 1964 trial to emphasise the value of audio preservation. Next Stephen Gray from JISC Digital Media spoke about how students are using audio-visual content in their research. He mentioned the difficulties researchers find when citing videos, especially those on YouTube that may disappear at any time! To round off the morning John Zubrycki from BBC R and D spoke about Challenges and Solutions in Broadcast Archives. One of the many interesting facts that he mentioned was that subtitle files originally produced by the BBC for broadcast have been used as a tool for search and retrieval of video content.

After enjoying lunch and the beautiful sunny weather on the British Library terrace we moved onto the afternoon programme based on specific projects and tools. Richard Wright of the BBC spoke about the Presto Centre and the tools it has developed to help with audio-visual preservation. He also spoke about the useful digital preservation tools available online via Presto Space. Sue Allcock and James Alexander then discussed the Outcomes and Lessons learnt from the Access to Video Assets Project at the Open University which makes past video content from the Open University’s courses available to OU staff through a Fedora repository. Like the BBC, discovering subtitle files has allowed the OU to index their audio-visual collections. Finally Simon Dixon from the Centre for Digital Music Queen Mary University spoke about emerging tools for digital sound.

A final wide ranging discussion about collaboration and next steps followed which included discussion about storage as well as ideas for a future event addressing the contexts of audio-visual resources. I left the event with my mind full of new information and lots of pointers for places to look to help me consider the next steps for our digital video collections… watch this space.

-Emma Hancox

The Case for Digital Preservation

Now, I’m pretty sure there is no need for me to make the case to the good readers of this blog, but if you’re ever stuck for something to say about why your work is important – for example at parties – then the demise of the print edition of the OED seems a good candidate!

OK, so no one is about to ditch the Pocket version, or even the Shorter (I got one of those for a graduation present from my Grandma!), but even so…

The last print OED was published in 1989. I imagine, given the regular updates to the OED online, that there has been a substantial influx of words since 1989 and I guess (given how Chaucer looks now) English will undergo some significant changes in the future. Unless we (the DP community) decide to preserve the digital OED, we will condemn readers of 2489 to struggle on with an antique 1989 print copy and much will they wonder when they don’t find things like “Internet”…

(Mind you, the electricity might have all run out by then so it wont really matter…)

On the flip side, and no doubt something someone at the party will point out, this is also a case for continuing to print the OED – at least a few copies, kept in safe places… 😉

-Peter Cliff

Par2ty

This is probably an old and battered hat for you good folks (seeing as the Web site’s last “announcement” was in 2004!), but most days I still feel pretty new to this whole digital archiving business – not just with the “archive” bit, but also the “digital preservation”, um, bit so it was news to me… 😉

Perusing the latest Linux Format at the weekend, I chanced on an article by Ben Martin (I couldn’t find a Web site for him…) about parchive and specifically par2cmdline.

Par-what? I hear you ask? (Or perhaps “oh yeah, that old thing” ;-))

Par2 files are what the article calls “error correcting files”. A bit like checksums, only once created they can be used to repair the original file in the event of bit/byte level damage.

Curious.

So I duly installed par2 – did I mention how wonderful Linux (Ubuntu in this case) is? – the install was simple:

sudo apt-get install par2

Then tried it out on a 300MB Mac disk image – the new Doctor Who game from the BBC – and guess what? It works! Do some damage to the file with dd, run the verify again and it says “the file is damaged, but I can fix it” in a reassuring HAL-like way (that could be my imagination, it didn’t really talk – and if it did, probably best not to trust it to fix the file right…)

The par2 files totalled around 9MB at “5% redundancy” – not quite sure what that means – which isn’t much of an overhead for a some extra data security… I think, though I’ve not tried, that it is integrated into KDE4 too for a little bit of personal file protection.

The interesting thing about par2 is that it comes from an age when bandwidth was limited. If you downloaded a large file and it was corrupt, rather than have to download it again, you simply downloaded the (much smaller) par2 file that had the power to fix your download.

This got me thinking. Is there then any scope for archives to share par2 files with each other? (Do they already?) We cannot exchange confidential data but perhaps we could share the par2 files, a little like a pseudo-mini-LOCKSS?

All that said, I’m not quite sure we will use parchive here, though it’d be pretty easy to create the par2 files on ingest. In theory our use of ZFS, RAID, etc. should be covering this level of data security for us, but I guess it remains an interesting question – would anything be gained by keeping par2 data alongside our disk images? And, after Dundee, would smaller archives be able to get some of the protection offered by things like ZFS, but in a smaller, lighter way?

Oh, and Happy Summer Solstice!

-Peter Cliff

Carved in Silicon

Just found an article on the BBC site that is of interest – ‘Rosetta stone’ offers digital lifeline. Some nice pointers to research on the life of CDs and DVDs with numbers to use at presentations and it is comforting to read that what we’re trying to do Just Aint Easy(tm).

I rather like this too:

“…the digital data archivists’ arch enemy: magnetic polarity

(I added the bold!)

Does that make digital archivists like the X-Men ? 😉

-Peter Cliff